Is there REALLY such a thing as sex addiction??? And how would going to a fancy rehab center help someone?

Seems like every week some celeb is going into rehab for “sex addiction”?? WTH? David Duchovny, Tiger Woods, Jesse James….are the ones I can think of off the top of my head. Is there really such a thing as sex addiction or is it just having too much fame, money, good looks, fans? I’ve never heard of anyone having this but a celebrity.